Many species form stable pair bonds, but still mate with other individuals outside the pair.
In biology, incidents of promiscuity in species that form pair bonds are usually called extra-pair copulations.
Feminists have traditionally argued a significant double standard exists between how men and women are judged for promiscuity.
Historically, stereotypes of the promiscuous woman have tended to be negative, such as "the slut" or "the harlot", while male stereotypes have been more varied, some expressing approval, such as "the stud" or "the player", while others imply societal deviance, such as "the womanizer" or "the philanderer".
New Zealand women had the highest number of sex partners for females in the world with an average of 20.4 sexual partners.
In all of the countries surveyed, except New Zealand, men reported more sexual partners than women.
Much more predictive of sexual-health status are socioeconomic factors like poverty and mobility. university study of international promiscuity found that Finns have had the largest number of sex partners in the industrialized world, and British people have the largest number among big western industrial nations.
Britain’s ranking was "ascribed to factors such as the decline of religious scruples about extramarital sex, the growth of equal pay and equal rights for women and a highly sexualised popular culture".